Just for reference as I see a number of folks have said it does work...
it explicitly states on the Maglula site that it DOES work on the Shield and also states explicitly which model S&W firearms' mags it won't work on...
maglula | Tools for loading and unloading magazines
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S&W 7rd 9mm SS for models 908,3913,3913,3953 & 3954 (Beak too wide, does not enter between lips). It will load the S&W Shield magazine !
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